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3 Commits

Author SHA1 Message Date
Simon Pilgrim
169b408a54 [VectorLegalizer] Expansion of CTLZ using CTPOP when possible 
This patch avoids scalarization of CTLZ by instead expanding to use CTPOP (ref: "Hacker's Delight") when the necessary operations are available.

This also adds the necessary cost models for X86 SSE2 targets (the main beneficiary) to ensure vectorization only happens when its useful.

Differential Revision: https://reviews.llvm.org/D25910

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286233 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-11-08 14:10:28 +00:00
Simon Pilgrim
d81c2d5aa5 [X86][SSE] Add initial costs for vector CTTZ/CTLZ 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277716 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-08-04 10:51:41 +00:00
Simon Pilgrim
874ffbec05 [SLPVectorizer][X86] Added CTPOP/CTLZ/CTTZ vectorization tests 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268800 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-05-06 21:33:01 +00:00